Drainfield Trench Product Sizing

NSF/ANSI 240 establishes minimum material, design, construction and performance requirements to evaluate dispersal drainfield products used as alternatives to traditional stone or gravel trenches.

The test procedures emphasize hydraulics and measure performance over time in parallel comparisons between a conventional gravel drain field and a gravelless trench. The standard applies to both newer technologies, which are tested in a laboratory, and technologies in use for 10 or more years, which are evaluated in the field.

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